EFR32xG22 2.4 GHz +6 dBm Radio Board

Overview

The EFR32xG22 Wireless Gecko 2.4 GHz +6 dBm Radio Board is available standalone and as part of the EFR32xG22 Wireless Gecko Starter Kit. It is a complete reference design for the EFR32xG22 Wireless SoC, with matching network and a PCB antenna for 6 dBm output power in the 2.4 GHz band.

See Radio Boards for more information about the Wireless Mainboard platform.

Hardware

  • EFR32MG22C224F512IM40 SoC

  • CPU core: ARM Cortex®-M33 with FPU, DSP and TrustZone

  • Memory: 512 kB Flash, 32 kB RAM

  • Transmit power: up to +6 dBm

  • Operation frequency: 2.4 GHz

  • Crystals for LFXO (32.768 kHz) and HFXO (38.4 MHz)

  • 8 Mbit SPI NOR Flash

For more information about the EFR32MG22 SoC and BRD4182A board, refer to these documents:

Supported Features

The slwrb4182a board supports the hardware features listed below.

on-chip / on-board
Feature integrated in the SoC / present on the board.
2 / 2
Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files.
vnd,foo
Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.

System Clock

The EFR32MG22 SoC is configured to use the HFRCODPLL oscillator at 76.8 MHz as the system clock, locked to the 38.4 MHz external crystal oscillator on the board.

Serial Port

The EFR32MG22 SoC has two USARTs and one EUART. USART1 is connected to the board controller and is used for the console.

Programming and Debugging

The slwrb4182a board supports the runners and associated west commands listed below.

flash debug

Connect the BRD4001A mainboard with a mounted BRD4182A radio board to your host computer using the USB port.

Here is an example for the Hello World application.

# From the root of the zephyr repository
west build -b slwrb4182a samples/hello_world
west flash

Open a serial terminal (minicom, putty, etc.) with the following settings:

  • Speed: 115200

  • Data: 8 bits

  • Parity: None

  • Stop bits: 1

Reset the board and you should see the following message in the terminal:

Hello World! slwrb4182a

Bluetooth

To use Bluetooth functionality, run the command below to retrieve necessary binary blobs from the Silicon Labs HAL repository.

west blobs fetch hal_silabs

Then build the Zephyr kernel and a Bluetooth sample with the following command. The Observer sample application is used in this example.

# From the root of the zephyr repository
west build -b slwrb4182a samples/bluetooth/observer